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1 Answer

Prasenjeet,

The problem is :   49/(49000*1.660*10-27)=6.022*10^23

Use scientific notation & simplify:

49/(49*10^3 * 1.660 * 10^-27)=  

1/(10^3 * 1.660 * 10^-27)

1/(1.660 * 10^-24) =

(1/1.660)*10^24 =

6.024 * 10^23

Note:  The original problem has a most 2 significant digits (ie 49) so the answer should be reduced to 2 significant digits also:

6.0 * 10^23

BruceS

 

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